Improvement in emery-wheels



mi :tant

MW ww ADDISON MSAWYER, or

A'rHoL, MASSACHUSETTS.

Lette/rs Patent N o. 85,537, lated J cmuary 5, 1869; anteclatezl December 26, 1868.

IMPRQVEMENT IN EMERY-WHEELS The Schedule refened to in these Letters Patent and making part of the saine.

To all whom it mcyrconccrn:

Be it known that I, ADDISON M. SAWYER, ofAthol,

.in the county of Worcester, and State of Massachusetts, have invented a new Mode Vof Constructing a Polishing-Band, or appliance for polishing and grinding metals androthcr materials; and I do hereby declare that the following is a full, clear, and exact description ofthe same, taken in connection with the accompanying drawings, making a part of this specifi- K other instruments for polishing; and consists'iuforming the band cfa polishing-compoiind composed of emery and soft rubber, as will be described, united to 'a strip of cloth or other material that will be practically inelastic in the direction` of its length, by which the elasticity of the rubber is counteracted in that direction, and by which the band can be more readily securedto the wheel or other implement upon which it is to be used.

The method of making the band is as follows:

I rst .make a compound of emery or other grit and the ordinary soft rubber, ground together by mastication, between rollers, in the usual way, as is described in Letters Patent heretofore granted to me for such compound, excepting that when the compound is used in a fixed form, as upon' a polishing-wheel, for instance,where no flexibility is required, the proportion of emery may be increased to an extent limited only by the capacity of the soft rubber to hold it tirmly.

When the ingredients are properly mixed, I roll the mass into a sheet of the thickness desired, from which a. strip is cut, of the proper length and width to form the acting surface of the wheel or other polishing-im'- plement. I then take a strip o'f canvas, well stretched, of the proper length, and cover one side of it with rnbber cement, worked into'the -body of the cloth. I then wrap this around a former, of thediameter desired to be given to the interior of the band, with the cemented side outward, and join the ends by lapping, or by a patch upon the outside. Upon the outside of this I place a thin layer of soft rubber, ready for vulcaniziug, and upon the outside of this the layer of emery com- -pound first described, nicely joining the ends of each with cement.

The whole is then put into a mould, which gives form to both the inside and outside ofthe band, and is then vulcanized or cured by heat in the usual way.

The band thus formed'is applied to the Wheel by being forced on to it snug, and'further secured by glue, she-llac, mastic, or other appropriate cement, interposed between the surfaces.

A wheel thusrnade is shown in figs. 1 and 2 of the drawings, where a represents the compound of emery and rubber; l), the layer of soft rubber; c, the canvas; and (l, the wheel.

The baud thus made has a slight degree of elasticity beyond what is due to the rubber compound, by the use of the thin layer of soft rubber l1, but it may be made without this, in which case a thick layer ofrubber cement would be interposed between the canvas and the emery compound, as is shown in iig. 3, and then vulcanized in a mould, as before stated.

Instead of the cloth foundation, leather Well stretched, or other material that will not stretch, and will stand the heat of vulcanizing, and to which the rubber will adhere, may be used, but the mode of construction Vit as an embodiment of my invention.

l do not herein claim thel composition of soft rubber and emery to form a polishing-compound, nor the em- Executed, May 22, 1868.

' A. M. SAW'YER.

Witnesses:

F. F. FAX', H. A. FAY.

that I have described I deem the best, and have shown' ployment of a backing or cushionl of soft rubber, in 

